Burn is using card effects to inflict damage, Stall is purposely extending the duration of the game, Rabbit refers to Rescue Rabbit, FTK (First-Turn Kill) and OTK (One-Turn Kill) rely on wining the duel in 1 turn through special conditions, Deck Out is any deck that makes your opponent lose by not being able to draw.

i think lightsworn should not be alowed, at least by testers becouse i have a good deck, but my tester, all 3 matches, got out Judjment dragon within 3 turns, wich means i didn't last more than 5 turns. its not even enough time to see deck

It has nothing to do with your skill. Lightsworn are a tough deck to go against. But outside of Judgment Dragon, they really have nothing to be afraid of. They might be hit by the single card limitation on the new list.